If you like to work at an ultra elite law firm

This is an issue which are concerned by many people and there are many different opinions, but in my opinion, it is very hard to generalize, because one's experience is a function of the particular deals, particular clients and particular partners you work for.
 
On average "ultra-elite" firms, however defined, have higher hours expectations, work on larger deals and tend to do more interesting/less commoditizable work. Your individual experience will vary, but I think on average that means that associates tend to work longer hours and do more interesting work. Top law firms also tend to recruit more associates from top law schools, so you'll be spending more time with Harvard and Yale grads than you would at a generic V100. 
 
Anecdotally, there does not seem to be any material difference in the types of work that are done by top law firms versus the V100 generally, and one sees more than just other top law firms across the table on deals. Again, anecdotally, I have not noticed any material difference in quality of work product between top firms and other firms, but have noticed a great deal of variation generallly, even within individual firms, so it would be hard to tell. People at top firms do not seem to look down on other firms; firm snobbery seems to exist only in law school, in my experience.

there are a few suggestions that it lead-in should tell you something as a starting point — almost none of the people I started with at my first firm still work there, and none of the people I knew at W and C still work at either place. There is very high turnover at the high end of biglaw; this turnover is expected and is actually necessary for the business model to work (even at W, which has relatively lower leverage than the rest of biglaw).